Organometallic substance, solid, pyrophoric, water-reactive
HMT 15 June 2026
Reference only — HMT snapshot for inspection and audit support; not a shipping paper, placard mandate, or CVI record.
Use Print / PDF below for field notes.
- UN / ID
- UN 3393
- Hazard class
- 4.2
- Packing group
- I
- ERG guide
- ERG 135
- Special provisions
- SP B11, SP T21, SP TP7, SP TP33, SP TP36, SP TP47
- Source
- 49 CFR §172 (15 June 2026)
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Organometallic substance, solid, pyrophoric, water-reactive
Organometallic chemistry is the study of organometallic compounds, chemical compounds containing at least one chemical bond between a carbon atom of an organic molecule and a metal, including alkali, alkaline earth, and transition metals, and sometimes broadened to include metalloids like boron, silicon, and selenium, as well. Aside from bonds to organyl fragments or molecules, bonds to 'inorganic' carbon, like carbon monoxide (metal carbonyls), cyanide, or carbide, are generally considered to be organometallic as well. Some related compounds such as transition metal hydrides and metal phosphine complexes are often included in discussions of organometallic compounds, though strictly speaking, they are not necessarily organometallic. The related but distinct term "metalorganic compound" refers to metal-containing compounds lacking direct metal-carbon bonds but which contain organic ligands Wikipedia
Hazardous Materials Table
Source:
49 CFR §172 (15 June 2026)
(3) Hazard class 4.2
Spontaneously combustible materials |
UN 3393 |
I |
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This entry is signed with "G". The letter "G" identifies proper shipping names for which one or more technical names of the hazardous material must be entered in parentheses, in association with the basic description. (See §172.203(k)).
×Note:Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs. | B11 | Tank car tanks must have a test pressure of at least 2,068.5 kPa (300 psig). Cargo and portable tanks must have a design pressure of at least 1,207 kPa (175 psig). Browse special provision B11 |
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| T21 | | Minimum test pressure (bar) | 10 |
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| Minimum shell thickness | 10 mm |
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| Pressure-relief requirements | Normal |
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| Bottom opening requirements | Prohibited for liquids. § 178.275(d)(2). |
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Browse special provision T21 |
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| TP7 | |
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| TP33 | The portable tank instruction assigned for this substance applies for granular and powdered solids and for solids which are filled and discharged at temperatures above their melting point which are cooled and transported as a solid mass. Solid substances transported or offered for transport above their melting point are authorized for transportation in portable tanks conforming to the provisions of portable tank instruction T4 for solid substances of packing group III or T7 for solid substances of packing group II, unless a tank with more stringent requirements for minimum shell thickness, maximum allowable working pressure, pressure-relief devices or bottom outlets are assigned in which case the more stringent tank instruction and special provisions shall apply. Filling limits must be in accordance with portable tank special provision TP3. Solids meeting the definition of an elevated temperature material must be transported in accordance with the applicable requirements of this subchapter. Browse special provision TP33 |
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| TP36 | For material assigned this portable tank special provision, portable tanks used to transport such material may be equipped with fusible elements in the vapor space of the portable tank. Browse special provision TP36 |
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| TP47 | The 2.5 year internal examination may be waived or substituted by other test methods or inspection procedures specified by the competent authority or its authorized body, provided that the portable tank is dedicated to the transport of the organometallic substances to which this tank special provision is assigned. However this examination is required when the conditions of § 180.605(f) are met. Browse special provision TP47 |
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| (9A) Passenger aircraft/rail | Forbidden |
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| (9B) Cargo aircraft only | Forbidden |
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| (10A) Location | D Stowage category “D” means the material must be stowed “on deck only” on a cargo vessel or on a passenger vessel carrying a number of passengers limited to not more than the larger of 25 passengers or one passenger per each 3 m of overall vessel length, but the material is prohibited on a passenger vessel in which the limiting number of passengers is exceeded. Source: 49 CFR §172.101(k) |
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| (10B) Other | |
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Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
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Must not be loaded, transported, or stored together in the same vehicle or facility. |
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May be loaded, transported, or stored together. |
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May be loaded, transported, or stored together only with restrictions. |
Similar substances
| UN / ID | Proper shipping name | Hazard class |
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| UN 3394 | Organometallic substance, liquid, pyrophoric, water-reactive | 4.2 |
| UN 3396 | Organometallic substance, solid, water-reactive, flammable | 4.3 |
| UN 3397 | Organometallic substance, solid, water-reactive, self-heating | 4.3 |
| UN 3399 | Organometallic substance, liquid, water-reactive, flammable | 4.3 |
| UN 3391 | Organometallic substance, solid, pyrophoric | 4.2 |
| UN 3392 | Organometallic substance, liquid, pyrophoric | 4.2 |
| UN 3395 | Organometallic substance, solid, water-reactive | 4.3 |
| UN 3398 | Organometallic substance, liquid, water-reactive | 4.3 |
| UN 3400 | Organometallic substance, solid, self-heating | 4.2 |
| UN 3467 | Organometallic compound, solid, toxic, n.o.s | 6.1 |
| UN 3282 | Organometallic compound, liquid, toxic, n.o.s | 6.1 |
